Process of recovering by-products from distilery-slop.



UNITED STATES PAT T OFFICE.

ALADAR Von LASZLOFFY, OF PEORIA, ILLINOIS.

PROCESS OF RECOVERING IBY-PRODUCTS FROM DISTILLERY-SLOP.

No Drawing. Original application filed January 30, 1911, Serial No. 605,611.

Specification of Letters Patent.

Patented Apr. 4;, 1916.

Divided and this application filed July 3, 1913. Serial No. 777,263.

To all whom it may concern:

Be it known that I, ALADAR VON LASZ- LorrY, a citizen of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented -certain new slop from one another, the, separation being accomplished by making use of the more ready solubility of the salts of one of said acids comparedwith that of the other when combined with the same base.

The lactates and succinates of the same base difier in the ease of solubility and I have found that the difference is so pronounced that it can be used with great advantage for the separation of the two acids. For instance I make use of the difference in the solubility of the lactates and suecinates of alkaline earth and preferably the difi'erence in the solubility of the lime-salts of lactic acid and succinic acid in ,water.

The use of 'lime as a basis and of water as a solvent make this process very economical on account of the low cost of lime and the ease and consequent cheapness with which water can be handled as compared with such solvents as must be recovered, because of their value.

' The separation of the two acids from any mixture containing them .is best accomplished when other substances such as have a tendency to prevent precipitation or crystallization are first eliminated from said mixture and although the elimination of these substances is preferable it is not an absolute necessity in the practice of my invention that those substances should'be removed.

The process is especially advantageous in the separation of lactic and succinic acids derived from such mixtures as are obtained by treating distillery slop with solvents and the following example is the preferred mode of procedure: Concentrated or dried distillery-slop is treated with a solvent such as alcohol, for example, and by this treatment a solution is obtained which contains lactic and succinic acids. The alcohol vis preferably evaporated from this solution and the remaining extract is subjected to my improved process forming the subject of this application forv separating the extract into lactic and succinic acids. First, the extract is treated with lime, in order to transform the acids into their respective lime-salts. The mixture containing the lactate and succinate of lime is then treated with water in a sufiicient proportion to keep the. lactate in solution, while the insoluble residue contains the succinate of lime. The quantity of water added is of course governed by the amount of water already present in the mixture which may from previous operations contain enough water to keep the lactate in solution. The two parts are separated by settling, filtering or by employing centrifugal force or other similar or suitable means. The residue maybe treated again with a small quantity of water thus repeating the process so as to eliminate the lime lactate entirely from the insoluble residue and the resulting weaker solutions can be used for the treatment of new portions of a mixture containing lactates and succinates of lime. After separating the lactates and succinates in this manner the acids are isolated from the salts by decomposing the salts with stronger acidspreferably sulfuric acid.

I have stated that the separation of the as a mixture of alcohol and ether, for in.

stance, which will dissolve the glycerin leav-- 'ing the lactate and succinate of. lime in. a

state of greater purity, thus making their separation much easier of accomplishment.

It is obvious that the process can be varied in different Ways. I do not confine myself therefore, to the exact process described.

This is a divisional application of my pending one #605,611, filed January 80, 1911.

sisting in combining the mixture With an alkaline earth and treating the mixture With Water to separate the resulting succinate of the alkaline earth from the substances of higher solubility present in the mixture.

3. The process of separating succinic acid from a mixture of substances derived from distillery-slop, consisting in combining the acids contained in said mixture With lime and treating said mixture With water.

4. In the process of recovering by-products from distillery-slop, the process of separating succinic acid from lactic acid in a mixture of thesame, consisting in adding a base to said mixture to produce succinates and lactates of the same base, and separatmg the resulting salts from one another by treating the mixture with Water.

rating the salts of said acids by dissolving I that most easily soluble.

6. In the process of recovering by-products from distillery-slop, the process of separating succinic acid and lactic acid from one another in a mixture of the same consisting in combining an alkaline earth With the mixture and separating the resulting succinate from the lactate by treating the mixture with Water.

7. In the process of recovering by-products from distillery-slop, the process of separating succinic acid and lactic acid from one another consisting in combining lime With a mixture containing said acids, and separating their salts from one another by dissolving the lactate of lime.

8. In the process of recovering by-products from distillery-slop, the process of separating succinic and lactic acids from one another consisting in combining lime With.

the mixture containing said acids, and separating the resulting succinate of lime from the lactate by dissolving the latter in Water. .In testimony whereof I afiix my signature, in presence of tWo Witnesses.

ALADAR VON LASZLOFFY. Witnesses:

W. I. SLEMMONS, L. M. THURLOW. 

